Gomery



PATENTED ocT. 29, 1850.

B. MONTGOMERY- CORRUGATED BOILER.

RICHARD MONTGOMERY, OF NEW YORK, N. Y.

CORRUGATED BOILER.

Specification of Letters Patent No. 7,742, dated October 29, 1850.

T 0 all whom it may concern Be it known that I, RICHARD MONT- GOMERY, of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Steam-Boilers, and that the following is a full, clear, and exact description of the principle or character which distinguishes them from all other things before known and of the usual manner of making, modifying, and using the same, reference being had to the accompanying drawing, in which Figure 1, is a section of an upright tubular boiler. Fig. 2, is an end elevation of the same showing its outline. Fig. 3, is a tube. Fig. I, is aperspective view. of the same, with the end removed. Fig. 5, is a perspective view of an arched boiler with the end removed. Fig. 6', an end view of the same.

This invention consists in forming cylindrical flues, the curved fire arches, and if deemed advisable, the curved shells of boilers, of corrugated metal.

I am well aware that corrugated metal has been used in water tables in the form of straight corrugated sides in steam boilers, the projections resting against others, as in Hancocks boiler, and some others; but these do not eflect the object proposed by me, which is to give strength and security to the arches and make them self-sustaining, without the aid of the innumerable stays with which most boilers especially high pressure ones, are obliged to be furnished, that add immensely to their weight, and greatly increase their liability to burn out and scale; the expense of their construction, and the difficulty of repair, for instance, the tire arch of a locomotive boiler is required to be stayed with a great number of angle iron ribs, or other equivalents and the iron itself must. be very thick, of which the arch is composed. Other boilers for marine purposes have to be stayed throughout, and their flues braced in the manner so well known as to need no particular description. To obviate the difficulties above named I employ corrugated arches, and cylindrical corrugated fiues which are sustained on similar principles. An incidental advantage gained by this form, is, that there is a great extension of fire surface, and an equal de gree of strength with thinner iron than can now be employed in fire arches.

The difference between the devices em ployed by me and my predecessors is so obvious that mere inspection of them will clearly show it. I contemplate using this corrugated surface in the flues and arches of boilers, as shown in the drawings; and when great strength and lightness are required the shell of the boiler should be made also of the corrugated plates. I do not deem it es sential to dwell on the arch form of corrugated plates for sustaining high pressures, as any competent engineer will-at once see and admit it, when the idea is pointed out and the peculiar adaptation of these to arches of fire chambers in steam boilers.

Having pointed out the novelties I desire to cover, what I claim therein as new and which I desire to secure by Letters Patent 1s- The employment of corrugated plates of metal for forming the curved arches of fire chambers and shells of steam boilers, the

corrugations running in the direction of the curves, substantlally as descrlbed.

RICHARD MONTGOMERY.

\Vitnesses IV. M. IVALKER, \VM. GREENOUGH. 

